hum... good topic! let me ask a question: the persistence.xml has the information about the persistence driver (if it should use Postgresql or Oracle, for example) but, if I put this information inside persistence.xml, if I change the database, I will have to recompile the jars with the correct persistence.xml is there a workaround to avoid recompiling the jar? thanks in advance View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4139456#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...